/*
 * This file is part of gtkD.
 *
 * gtkD is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version, with
 * some exceptions, please read the COPYING file.
 *
 * gtkD is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with gtkD; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
 */

// generated automatically - do not change
// find conversion definition on APILookup.txt
// implement new conversion functionalities on the wrap.utils pakage


module gdk.Device;

private import gdk.Cursor;
private import gdk.DeviceTool;
private import gdk.Display;
private import gdk.Screen;
private import gdk.Seat;
private import gdk.Window;
private import glib.ListG;
private import glib.Str;
private import gobject.ObjectG;
private import gobject.Signals;
private import gtkc.gdk;
public  import gtkc.gdktypes;
private import std.algorithm;


/**
 * The #GdkDevice object represents a single input device, such
 * as a keyboard, a mouse, a touchpad, etc.
 * 
 * See the #GdkDeviceManager documentation for more information
 * about the various kinds of master and slave devices, and their
 * relationships.
 */
public class Device : ObjectG
{
	/** the main Gtk struct */
	protected GdkDevice* gdkDevice;

	/** Get the main Gtk struct */
	public GdkDevice* getDeviceStruct(bool transferOwnership = false)
	{
		if (transferOwnership)
			ownedRef = false;
		return gdkDevice;
	}

	/** the main Gtk struct as a void* */
	protected override void* getStruct()
	{
		return cast(void*)gdkDevice;
	}

	protected override void setStruct(GObject* obj)
	{
		gdkDevice = cast(GdkDevice*)obj;
		super.setStruct(obj);
	}

	/**
	 * Sets our main struct and passes it to the parent class.
	 */
	public this (GdkDevice* gdkDevice, bool ownedRef = false)
	{
		this.gdkDevice = gdkDevice;
		super(cast(GObject*)gdkDevice, ownedRef);
	}


	/** */
	public static GType getType()
	{
		return gdk_device_get_type();
	}

	/**
	 * Frees an array of #GdkTimeCoord that was returned by gdk_device_get_history().
	 *
	 * Params:
	 *     events = an array of #GdkTimeCoord.
	 *     nEvents = the length of the array.
	 */
	public static void freeHistory(GdkTimeCoord*[] events)
	{
		gdk_device_free_history(events.ptr, cast(int)events.length);
	}

	/**
	 * Determines information about the current keyboard grab.
	 * This is not public API and must not be used by applications.
	 *
	 * Deprecated: The symbol was never meant to be used outside
	 * of GTK+
	 *
	 * Params:
	 *     display = the display for which to get the grab information
	 *     device = device to get the grab information from
	 *     grabWindow = location to store current grab window
	 *     ownerEvents = location to store boolean indicating whether
	 *         the @owner_events flag to gdk_keyboard_grab() or
	 *         gdk_pointer_grab() was %TRUE.
	 *
	 * Returns: %TRUE if this application currently has the
	 *     keyboard grabbed.
	 */
	public static bool grabInfoLibgtkOnly(Display display, Device device, out Window grabWindow, out bool ownerEvents)
	{
		GdkWindow* outgrabWindow = null;
		int outownerEvents;
		
		auto p = gdk_device_grab_info_libgtk_only((display is null) ? null : display.getDisplayStruct(), (device is null) ? null : device.getDeviceStruct(), &outgrabWindow, &outownerEvents) != 0;
		
		grabWindow = ObjectG.getDObject!(Window)(outgrabWindow);
		ownerEvents = (outownerEvents == 1);
		
		return p;
	}

	/**
	 * Returns the associated device to @device, if @device is of type
	 * %GDK_DEVICE_TYPE_MASTER, it will return the paired pointer or
	 * keyboard.
	 *
	 * If @device is of type %GDK_DEVICE_TYPE_SLAVE, it will return
	 * the master device to which @device is attached to.
	 *
	 * If @device is of type %GDK_DEVICE_TYPE_FLOATING, %NULL will be
	 * returned, as there is no associated device.
	 *
	 * Returns: The associated device, or
	 *     %NULL
	 *
	 * Since: 3.0
	 */
	public Device getAssociatedDevice()
	{
		auto p = gdk_device_get_associated_device(gdkDevice);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Device)(cast(GdkDevice*) p);
	}

	/**
	 * Returns the axes currently available on the device.
	 *
	 * Since: 3.22
	 */
	public GdkAxisFlags getAxes()
	{
		return gdk_device_get_axes(gdkDevice);
	}

	/**
	 * Interprets an array of double as axis values for a given device,
	 * and locates the value in the array for a given axis use.
	 *
	 * Params:
	 *     axes = pointer to an array of axes
	 *     use = the use to look for
	 *     value = location to store the found value.
	 *
	 * Returns: %TRUE if the given axis use was found, otherwise %FALSE
	 */
	public bool getAxis(double[] axes, GdkAxisUse use, out double value)
	{
		return gdk_device_get_axis(gdkDevice, axes.ptr, use, &value) != 0;
	}

	/**
	 * Returns the axis use for @index_.
	 *
	 * Params:
	 *     index = the index of the axis.
	 *
	 * Returns: a #GdkAxisUse specifying how the axis is used.
	 *
	 * Since: 2.20
	 */
	public GdkAxisUse getAxisUse(uint index)
	{
		return gdk_device_get_axis_use(gdkDevice, index);
	}

	/**
	 * Interprets an array of double as axis values for a given device,
	 * and locates the value in the array for a given axis label, as returned
	 * by gdk_device_list_axes()
	 *
	 * Params:
	 *     axes = pointer to an array of axes
	 *     axisLabel = #GdkAtom with the axis label.
	 *     value = location to store the found value.
	 *
	 * Returns: %TRUE if the given axis use was found, otherwise %FALSE.
	 *
	 * Since: 3.0
	 */
	public bool getAxisValue(double[] axes, GdkAtom axisLabel, out double value)
	{
		return gdk_device_get_axis_value(gdkDevice, axes.ptr, axisLabel, &value) != 0;
	}

	/**
	 * Returns the device type for @device.
	 *
	 * Returns: the #GdkDeviceType for @device.
	 *
	 * Since: 3.0
	 */
	public GdkDeviceType getDeviceType()
	{
		return gdk_device_get_device_type(gdkDevice);
	}

	/**
	 * Returns the #GdkDisplay to which @device pertains.
	 *
	 * Returns: a #GdkDisplay. This memory is owned
	 *     by GTK+, and must not be freed or unreffed.
	 *
	 * Since: 3.0
	 */
	public Display getDisplay()
	{
		auto p = gdk_device_get_display(gdkDevice);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Display)(cast(GdkDisplay*) p);
	}

	/**
	 * Determines whether the pointer follows device motion.
	 * This is not meaningful for keyboard devices, which don't have a pointer.
	 *
	 * Returns: %TRUE if the pointer follows device motion
	 *
	 * Since: 2.20
	 */
	public bool getHasCursor()
	{
		return gdk_device_get_has_cursor(gdkDevice) != 0;
	}

	/**
	 * Obtains the motion history for a pointer device; given a starting and
	 * ending timestamp, return all events in the motion history for
	 * the device in the given range of time. Some windowing systems
	 * do not support motion history, in which case, %FALSE will
	 * be returned. (This is not distinguishable from the case where
	 * motion history is supported and no events were found.)
	 *
	 * Note that there is also gdk_window_set_event_compression() to get
	 * more motion events delivered directly, independent of the windowing
	 * system.
	 *
	 * Params:
	 *     window = the window with respect to which which the event coordinates will be reported
	 *     start = starting timestamp for range of events to return
	 *     stop = ending timestamp for the range of events to return
	 *     events = location to store a newly-allocated array of #GdkTimeCoord, or
	 *         %NULL
	 *     nEvents = location to store the length of
	 *         @events, or %NULL
	 *
	 * Returns: %TRUE if the windowing system supports motion history and
	 *     at least one event was found.
	 */
	public bool getHistory(Window window, uint start, uint stop, out GdkTimeCoord*[] events)
	{
		GdkTimeCoord** outevents = null;
		int nEvents;
		
		auto p = gdk_device_get_history(gdkDevice, (window is null) ? null : window.getWindowStruct(), start, stop, &outevents, &nEvents) != 0;
		
		events = outevents[0 .. nEvents];
		
		return p;
	}

	/**
	 * If @index_ has a valid keyval, this function will return %TRUE
	 * and fill in @keyval and @modifiers with the keyval settings.
	 *
	 * Params:
	 *     index = the index of the macro button to get.
	 *     keyval = return value for the keyval.
	 *     modifiers = return value for modifiers.
	 *
	 * Returns: %TRUE if keyval is set for @index.
	 *
	 * Since: 2.20
	 */
	public bool getKey(uint index, out uint keyval, out GdkModifierType modifiers)
	{
		return gdk_device_get_key(gdkDevice, index, &keyval, &modifiers) != 0;
	}

	/**
	 * Gets information about which window the given pointer device is in, based on events
	 * that have been received so far from the display server. If another application
	 * has a pointer grab, or this application has a grab with owner_events = %FALSE,
	 * %NULL may be returned even if the pointer is physically over one of this
	 * application's windows.
	 *
	 * Returns: the last window the device
	 *
	 * Since: 3.12
	 */
	public Window getLastEventWindow()
	{
		auto p = gdk_device_get_last_event_window(gdkDevice);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Window)(cast(GdkWindow*) p);
	}

	/**
	 * Determines the mode of the device.
	 *
	 * Returns: a #GdkInputSource
	 *
	 * Since: 2.20
	 */
	public GdkInputMode getMode()
	{
		return gdk_device_get_mode(gdkDevice);
	}

	/**
	 * Returns the number of axes the device currently has.
	 *
	 * Returns: the number of axes.
	 *
	 * Since: 3.0
	 */
	public int getNAxes()
	{
		return gdk_device_get_n_axes(gdkDevice);
	}

	/**
	 * Returns the number of keys the device currently has.
	 *
	 * Returns: the number of keys.
	 *
	 * Since: 2.24
	 */
	public int getNKeys()
	{
		return gdk_device_get_n_keys(gdkDevice);
	}

	/**
	 * Determines the name of the device.
	 *
	 * Returns: a name
	 *
	 * Since: 2.20
	 */
	public string getName()
	{
		return Str.toString(gdk_device_get_name(gdkDevice));
	}

	/**
	 * Gets the current location of @device. As a slave device
	 * coordinates are those of its master pointer, This function
	 * may not be called on devices of type %GDK_DEVICE_TYPE_SLAVE,
	 * unless there is an ongoing grab on them, see gdk_device_grab().
	 *
	 * Params:
	 *     screen = location to store the #GdkScreen
	 *         the @device is on, or %NULL.
	 *     x = location to store root window X coordinate of @device, or %NULL.
	 *     y = location to store root window Y coordinate of @device, or %NULL.
	 *
	 * Since: 3.0
	 */
	public void getPosition(out Screen screen, out int x, out int y)
	{
		GdkScreen* outscreen = null;
		
		gdk_device_get_position(gdkDevice, &outscreen, &x, &y);
		
		screen = ObjectG.getDObject!(Screen)(outscreen);
	}

	/**
	 * Gets the current location of @device in double precision. As a slave device's
	 * coordinates are those of its master pointer, this function
	 * may not be called on devices of type %GDK_DEVICE_TYPE_SLAVE,
	 * unless there is an ongoing grab on them. See gdk_device_grab().
	 *
	 * Params:
	 *     screen = location to store the #GdkScreen
	 *         the @device is on, or %NULL.
	 *     x = location to store root window X coordinate of @device, or %NULL.
	 *     y = location to store root window Y coordinate of @device, or %NULL.
	 *
	 * Since: 3.10
	 */
	public void getPositionDouble(out Screen screen, out double x, out double y)
	{
		GdkScreen* outscreen = null;
		
		gdk_device_get_position_double(gdkDevice, &outscreen, &x, &y);
		
		screen = ObjectG.getDObject!(Screen)(outscreen);
	}

	/**
	 * Returns the product ID of this device, or %NULL if this information couldn't
	 * be obtained. This ID is retrieved from the device, and is thus constant for
	 * it. See gdk_device_get_vendor_id() for more information.
	 *
	 * Returns: the product ID, or %NULL
	 *
	 * Since: 3.16
	 */
	public string getProductId()
	{
		return Str.toString(gdk_device_get_product_id(gdkDevice));
	}

	/**
	 * Returns the #GdkSeat the device belongs to.
	 *
	 * Returns: A #GdkSeat. This memory is owned by GTK+ and
	 *     must not be freed.
	 *
	 * Since: 3.20
	 */
	public Seat getSeat()
	{
		auto p = gdk_device_get_seat(gdkDevice);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Seat)(cast(GdkSeat*) p);
	}

	/**
	 * Determines the type of the device.
	 *
	 * Returns: a #GdkInputSource
	 *
	 * Since: 2.20
	 */
	public GdkInputSource getSource()
	{
		return gdk_device_get_source(gdkDevice);
	}

	/**
	 * Gets the current state of a pointer device relative to @window. As a slave
	 * device’s coordinates are those of its master pointer, this
	 * function may not be called on devices of type %GDK_DEVICE_TYPE_SLAVE,
	 * unless there is an ongoing grab on them. See gdk_device_grab().
	 *
	 * Params:
	 *     window = a #GdkWindow.
	 *     axes = an array of doubles to store the values of
	 *         the axes of @device in, or %NULL.
	 *     mask = location to store the modifiers, or %NULL.
	 */
	public void getState(Window window, double[] axes, out GdkModifierType mask)
	{
		gdk_device_get_state(gdkDevice, (window is null) ? null : window.getWindowStruct(), axes.ptr, &mask);
	}

	/**
	 * Returns the vendor ID of this device, or %NULL if this information couldn't
	 * be obtained. This ID is retrieved from the device, and is thus constant for
	 * it.
	 *
	 * This function, together with gdk_device_get_product_id(), can be used to eg.
	 * compose #GSettings paths to store settings for this device.
	 *
	 * |[<!-- language="C" -->
	 * static GSettings *
	 * get_device_settings (GdkDevice *device)
	 * {
	 * const gchar *vendor, *product;
	 * GSettings *settings;
	 * GdkDevice *device;
	 * gchar *path;
	 *
	 * vendor = gdk_device_get_vendor_id (device);
	 * product = gdk_device_get_product_id (device);
	 *
	 * path = g_strdup_printf ("/org/example/app/devices/%s:%s/", vendor, product);
	 * settings = g_settings_new_with_path (DEVICE_SCHEMA, path);
	 * g_free (path);
	 *
	 * return settings;
	 * }
	 * ]|
	 *
	 * Returns: the vendor ID, or %NULL
	 *
	 * Since: 3.16
	 */
	public string getVendorId()
	{
		return Str.toString(gdk_device_get_vendor_id(gdkDevice));
	}

	/**
	 * Obtains the window underneath @device, returning the location of the device in @win_x and @win_y. Returns
	 * %NULL if the window tree under @device is not known to GDK (for example, belongs to another application).
	 *
	 * As a slave device coordinates are those of its master pointer, This
	 * function may not be called on devices of type %GDK_DEVICE_TYPE_SLAVE,
	 * unless there is an ongoing grab on them, see gdk_device_grab().
	 *
	 * Params:
	 *     winX = return location for the X coordinate of the device location,
	 *         relative to the window origin, or %NULL.
	 *     winY = return location for the Y coordinate of the device location,
	 *         relative to the window origin, or %NULL.
	 *
	 * Returns: the #GdkWindow under the
	 *     device position, or %NULL.
	 *
	 * Since: 3.0
	 */
	public Window getWindowAtPosition(out int winX, out int winY)
	{
		auto p = gdk_device_get_window_at_position(gdkDevice, &winX, &winY);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Window)(cast(GdkWindow*) p);
	}

	/**
	 * Obtains the window underneath @device, returning the location of the device in @win_x and @win_y in
	 * double precision. Returns %NULL if the window tree under @device is not known to GDK (for example,
	 * belongs to another application).
	 *
	 * As a slave device coordinates are those of its master pointer, This
	 * function may not be called on devices of type %GDK_DEVICE_TYPE_SLAVE,
	 * unless there is an ongoing grab on them, see gdk_device_grab().
	 *
	 * Params:
	 *     winX = return location for the X coordinate of the device location,
	 *         relative to the window origin, or %NULL.
	 *     winY = return location for the Y coordinate of the device location,
	 *         relative to the window origin, or %NULL.
	 *
	 * Returns: the #GdkWindow under the
	 *     device position, or %NULL.
	 *
	 * Since: 3.0
	 */
	public Window getWindowAtPositionDouble(out double winX, out double winY)
	{
		auto p = gdk_device_get_window_at_position_double(gdkDevice, &winX, &winY);
		
		if(p is null)
		{
			return null;
		}
		
		return ObjectG.getDObject!(Window)(cast(GdkWindow*) p);
	}

	/**
	 * Grabs the device so that all events coming from this device are passed to
	 * this application until the device is ungrabbed with gdk_device_ungrab(),
	 * or the window becomes unviewable. This overrides any previous grab on the device
	 * by this client.
	 *
	 * Note that @device and @window need to be on the same display.
	 *
	 * Device grabs are used for operations which need complete control over the
	 * given device events (either pointer or keyboard). For example in GTK+ this
	 * is used for Drag and Drop operations, popup menus and such.
	 *
	 * Note that if the event mask of an X window has selected both button press
	 * and button release events, then a button press event will cause an automatic
	 * pointer grab until the button is released. X does this automatically since
	 * most applications expect to receive button press and release events in pairs.
	 * It is equivalent to a pointer grab on the window with @owner_events set to
	 * %TRUE.
	 *
	 * If you set up anything at the time you take the grab that needs to be
	 * cleaned up when the grab ends, you should handle the #GdkEventGrabBroken
	 * events that are emitted when the grab ends unvoluntarily.
	 *
	 * Deprecated: Use gdk_seat_grab() instead.
	 *
	 * Params:
	 *     window = the #GdkWindow which will own the grab (the grab window)
	 *     grabOwnership = specifies the grab ownership.
	 *     ownerEvents = if %FALSE then all device events are reported with respect to
	 *         @window and are only reported if selected by @event_mask. If
	 *         %TRUE then pointer events for this application are reported
	 *         as normal, but pointer events outside this application are
	 *         reported with respect to @window and only if selected by
	 *         @event_mask. In either mode, unreported events are discarded.
	 *     eventMask = specifies the event mask, which is used in accordance with
	 *         @owner_events.
	 *     cursor = the cursor to display while the grab is active if the device is
	 *         a pointer. If this is %NULL then the normal cursors are used for
	 *         @window and its descendants, and the cursor for @window is used
	 *         elsewhere.
	 *     time = the timestamp of the event which led to this pointer grab. This
	 *         usually comes from the #GdkEvent struct, though %GDK_CURRENT_TIME
	 *         can be used if the time isn’t known.
	 *
	 * Returns: %GDK_GRAB_SUCCESS if the grab was successful.
	 *
	 * Since: 3.0
	 */
	public GdkGrabStatus grab(Window window, GdkGrabOwnership grabOwnership, bool ownerEvents, GdkEventMask eventMask, Cursor cursor, uint time)
	{
		return gdk_device_grab(gdkDevice, (window is null) ? null : window.getWindowStruct(), grabOwnership, ownerEvents, eventMask, (cursor is null) ? null : cursor.getCursorStruct(), time);
	}

	/**
	 * Returns a #GList of #GdkAtoms, containing the labels for
	 * the axes that @device currently has.
	 *
	 * Returns: A #GList of #GdkAtoms, free with g_list_free().
	 *
	 * Since: 3.0
	 */
	public ListG listAxes()
	{
		auto p = gdk_device_list_axes(gdkDevice);
		
		if(p is null)
		{
			return null;
		}
		
		return new ListG(cast(GList*) p);
	}

	/**
	 * If the device if of type %GDK_DEVICE_TYPE_MASTER, it will return
	 * the list of slave devices attached to it, otherwise it will return
	 * %NULL
	 *
	 * Returns: the list of slave devices, or %NULL. The list must be
	 *     freed with g_list_free(), the contents of the list are
	 *     owned by GTK+ and should not be freed.
	 */
	public ListG listSlaveDevices()
	{
		auto p = gdk_device_list_slave_devices(gdkDevice);
		
		if(p is null)
		{
			return null;
		}
		
		return new ListG(cast(GList*) p);
	}

	/**
	 * Specifies how an axis of a device is used.
	 *
	 * Params:
	 *     index = the index of the axis
	 *     use = specifies how the axis is used
	 */
	public void setAxisUse(uint index, GdkAxisUse use)
	{
		gdk_device_set_axis_use(gdkDevice, index, use);
	}

	/**
	 * Specifies the X key event to generate when a macro button of a device
	 * is pressed.
	 *
	 * Params:
	 *     index = the index of the macro button to set
	 *     keyval = the keyval to generate
	 *     modifiers = the modifiers to set
	 */
	public void setKey(uint index, uint keyval, GdkModifierType modifiers)
	{
		gdk_device_set_key(gdkDevice, index, keyval, modifiers);
	}

	/**
	 * Sets a the mode of an input device. The mode controls if the
	 * device is active and whether the device’s range is mapped to the
	 * entire screen or to a single window.
	 *
	 * Note: This is only meaningful for floating devices, master devices (and
	 * slaves connected to these) drive the pointer cursor, which is not limited
	 * by the input mode.
	 *
	 * Params:
	 *     mode = the input mode.
	 *
	 * Returns: %TRUE if the mode was successfully changed.
	 */
	public bool setMode(GdkInputMode mode)
	{
		return gdk_device_set_mode(gdkDevice, mode) != 0;
	}

	/**
	 * Release any grab on @device.
	 *
	 * Deprecated: Use gdk_seat_ungrab() instead.
	 *
	 * Params:
	 *     time = a timestap (e.g. %GDK_CURRENT_TIME).
	 *
	 * Since: 3.0
	 */
	public void ungrab(uint time)
	{
		gdk_device_ungrab(gdkDevice, time);
	}

	/**
	 * Warps @device in @display to the point @x,@y on
	 * the screen @screen, unless the device is confined
	 * to a window by a grab, in which case it will be moved
	 * as far as allowed by the grab. Warping the pointer
	 * creates events as if the user had moved the mouse
	 * instantaneously to the destination.
	 *
	 * Note that the pointer should normally be under the
	 * control of the user. This function was added to cover
	 * some rare use cases like keyboard navigation support
	 * for the color picker in the #GtkColorSelectionDialog.
	 *
	 * Params:
	 *     screen = the screen to warp @device to.
	 *     x = the X coordinate of the destination.
	 *     y = the Y coordinate of the destination.
	 *
	 * Since: 3.0
	 */
	public void warp(Screen screen, int x, int y)
	{
		gdk_device_warp(gdkDevice, (screen is null) ? null : screen.getScreenStruct(), x, y);
	}

	protected class OnChangedDelegateWrapper
	{
		void delegate(Device) dlg;
		gulong handlerId;
		
		this(void delegate(Device) dlg)
		{
			this.dlg = dlg;
			onChangedListeners ~= this;
		}
		
		void remove(OnChangedDelegateWrapper source)
		{
			foreach(index, wrapper; onChangedListeners)
			{
				if (wrapper.handlerId == source.handlerId)
				{
					onChangedListeners[index] = null;
					onChangedListeners = std.algorithm.remove(onChangedListeners, index);
					break;
				}
			}
		}
	}
	OnChangedDelegateWrapper[] onChangedListeners;

	/**
	 * The ::changed signal is emitted either when the #GdkDevice
	 * has changed the number of either axes or keys. For example
	 * In X this will normally happen when the slave device routing
	 * events through the master device changes (for example, user
	 * switches from the USB mouse to a tablet), in that case the
	 * master device will change to reflect the new slave device
	 * axes and keys.
	 */
	gulong addOnChanged(void delegate(Device) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		auto wrapper = new OnChangedDelegateWrapper(dlg);
		wrapper.handlerId = Signals.connectData(
			this,
			"changed",
			cast(GCallback)&callBackChanged,
			cast(void*)wrapper,
			cast(GClosureNotify)&callBackChangedDestroy,
			connectFlags);
		return wrapper.handlerId;
	}
	
	extern(C) static void callBackChanged(GdkDevice* deviceStruct, OnChangedDelegateWrapper wrapper)
	{
		wrapper.dlg(wrapper.outer);
	}
	
	extern(C) static void callBackChangedDestroy(OnChangedDelegateWrapper wrapper, GClosure* closure)
	{
		wrapper.remove(wrapper);
	}

	protected class OnToolChangedDelegateWrapper
	{
		void delegate(DeviceTool, Device) dlg;
		gulong handlerId;
		
		this(void delegate(DeviceTool, Device) dlg)
		{
			this.dlg = dlg;
			onToolChangedListeners ~= this;
		}
		
		void remove(OnToolChangedDelegateWrapper source)
		{
			foreach(index, wrapper; onToolChangedListeners)
			{
				if (wrapper.handlerId == source.handlerId)
				{
					onToolChangedListeners[index] = null;
					onToolChangedListeners = std.algorithm.remove(onToolChangedListeners, index);
					break;
				}
			}
		}
	}
	OnToolChangedDelegateWrapper[] onToolChangedListeners;

	/**
	 * The ::tool-changed signal is emitted on pen/eraser
	 * #GdkDevices whenever tools enter or leave proximity.
	 *
	 * Params:
	 *     tool = The new current tool
	 *
	 * Since: 3.22
	 */
	gulong addOnToolChanged(void delegate(DeviceTool, Device) dlg, ConnectFlags connectFlags=cast(ConnectFlags)0)
	{
		auto wrapper = new OnToolChangedDelegateWrapper(dlg);
		wrapper.handlerId = Signals.connectData(
			this,
			"tool-changed",
			cast(GCallback)&callBackToolChanged,
			cast(void*)wrapper,
			cast(GClosureNotify)&callBackToolChangedDestroy,
			connectFlags);
		return wrapper.handlerId;
	}
	
	extern(C) static void callBackToolChanged(GdkDevice* deviceStruct, GdkDeviceTool* tool, OnToolChangedDelegateWrapper wrapper)
	{
		wrapper.dlg(ObjectG.getDObject!(DeviceTool)(tool), wrapper.outer);
	}
	
	extern(C) static void callBackToolChangedDestroy(OnToolChangedDelegateWrapper wrapper, GClosure* closure)
	{
		wrapper.remove(wrapper);
	}
}